Our drive entrance is 18ft long and 12ft of this is includes the drop-down into the road. We use the remaining 6ft to get in and out even though it doesn't have a drop-down into the road. Recently our trouble causing neighbours have decided to park blocking the 6ft without the drop-down.

Are they allowed to park in front of any entrance if it doesn't have a drop-down? I know out of courtesy people usually wouldn't do this, but they have no manners whatsoever.

Our property has been like this for years and no one else has ever blocked it.

Blocking a dropped kerb is definitely illegal & the Police will treat it as a crime under the fact that your access to the highway is prohibited.If it is a normal kerb then you cannot expect other people not to park there.It may be worth asking your local council to extend the dropped kerb for you & explain your difficulty or take a photograph to show them if they won't come out & inspect the situation

the law is simple ..you do not park across a dropped kerb ...if you do its obstruction ..but if you have no types of lines beside the rest of kerbs outside your house then anyone can park outside ..and they are well in their right ..without being rude

Regardless of drop kirb or not if your gate posts are 100 feet apart then this is your entrance and you can not park within this space. It doesn't matter about the drop kirb as you can class your drive as a "hard standing" and you don't need a drop kirb for this although you do need access to it.